1 /*- 2 * Copyright (c) 1995 Terrence R. Lambert 3 * All rights reserved. 4 * 5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 42 */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include "opt_ddb.h" 48 #include "opt_init_path.h" 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/exec.h> 53 #include <sys/file.h> 54 #include <sys/filedesc.h> 55 #include <sys/jail.h> 56 #include <sys/ktr.h> 57 #include <sys/lock.h> 58 #include <sys/loginclass.h> 59 #include <sys/mount.h> 60 #include <sys/mutex.h> 61 #include <sys/syscallsubr.h> 62 #include <sys/sysctl.h> 63 #include <sys/proc.h> 64 #include <sys/racct.h> 65 #include <sys/resourcevar.h> 66 #include <sys/systm.h> 67 #include <sys/signalvar.h> 68 #include <sys/vnode.h> 69 #include <sys/sysent.h> 70 #include <sys/reboot.h> 71 #include <sys/sched.h> 72 #include <sys/sx.h> 73 #include <sys/sysproto.h> 74 #include <sys/vmmeter.h> 75 #include <sys/unistd.h> 76 #include <sys/malloc.h> 77 #include <sys/conf.h> 78 #include <sys/cpuset.h> 79 80 #include <machine/cpu.h> 81 82 #include <security/audit/audit.h> 83 #include <security/mac/mac_framework.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_param.h> 87 #include <vm/pmap.h> 88 #include <vm/vm_map.h> 89 #include <sys/copyright.h> 90 91 #include <ddb/ddb.h> 92 #include <ddb/db_sym.h> 93 94 void mi_startup(void); /* Should be elsewhere */ 95 96 /* Components of the first process -- never freed. */ 97 static struct session session0; 98 static struct pgrp pgrp0; 99 struct proc proc0; 100 struct thread thread0 __aligned(16); 101 struct vmspace vmspace0; 102 struct proc *initproc; 103 104 int boothowto = 0; /* initialized so that it can be patched */ 105 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 106 "Boot control flags, passed from loader"); 107 int bootverbose; 108 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 109 "Control the output of verbose kernel messages"); 110 111 /* 112 * This ensures that there is at least one entry so that the sysinit_set 113 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 114 * executed. 115 */ 116 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 117 118 /* 119 * The sysinit table itself. Items are checked off as the are run. 120 * If we want to register new sysinit types, add them to newsysinit. 121 */ 122 SET_DECLARE(sysinit_set, struct sysinit); 123 struct sysinit **sysinit, **sysinit_end; 124 struct sysinit **newsysinit, **newsysinit_end; 125 126 /* 127 * Merge a new sysinit set into the current set, reallocating it if 128 * necessary. This can only be called after malloc is running. 129 */ 130 void 131 sysinit_add(struct sysinit **set, struct sysinit **set_end) 132 { 133 struct sysinit **newset; 134 struct sysinit **sipp; 135 struct sysinit **xipp; 136 int count; 137 138 count = set_end - set; 139 if (newsysinit) 140 count += newsysinit_end - newsysinit; 141 else 142 count += sysinit_end - sysinit; 143 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 144 if (newset == NULL) 145 panic("cannot malloc for sysinit"); 146 xipp = newset; 147 if (newsysinit) 148 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 149 *xipp++ = *sipp; 150 else 151 for (sipp = sysinit; sipp < sysinit_end; sipp++) 152 *xipp++ = *sipp; 153 for (sipp = set; sipp < set_end; sipp++) 154 *xipp++ = *sipp; 155 if (newsysinit) 156 free(newsysinit, M_TEMP); 157 newsysinit = newset; 158 newsysinit_end = newset + count; 159 } 160 161 /* 162 * System startup; initialize the world, create process 0, mount root 163 * filesystem, and fork to create init and pagedaemon. Most of the 164 * hard work is done in the lower-level initialization routines including 165 * startup(), which does memory initialization and autoconfiguration. 166 * 167 * This allows simple addition of new kernel subsystems that require 168 * boot time initialization. It also allows substitution of subsystem 169 * (for instance, a scheduler, kernel profiler, or VM system) by object 170 * module. Finally, it allows for optional "kernel threads". 171 */ 172 void 173 mi_startup(void) 174 { 175 176 register struct sysinit **sipp; /* system initialization*/ 177 register struct sysinit **xipp; /* interior loop of sort*/ 178 register struct sysinit *save; /* bubble*/ 179 180 #if defined(VERBOSE_SYSINIT) 181 int last; 182 int verbose; 183 #endif 184 185 if (boothowto & RB_VERBOSE) 186 bootverbose++; 187 188 if (sysinit == NULL) { 189 sysinit = SET_BEGIN(sysinit_set); 190 sysinit_end = SET_LIMIT(sysinit_set); 191 } 192 193 restart: 194 /* 195 * Perform a bubble sort of the system initialization objects by 196 * their subsystem (primary key) and order (secondary key). 197 */ 198 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 199 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 200 if ((*sipp)->subsystem < (*xipp)->subsystem || 201 ((*sipp)->subsystem == (*xipp)->subsystem && 202 (*sipp)->order <= (*xipp)->order)) 203 continue; /* skip*/ 204 save = *sipp; 205 *sipp = *xipp; 206 *xipp = save; 207 } 208 } 209 210 #if defined(VERBOSE_SYSINIT) 211 last = SI_SUB_COPYRIGHT; 212 verbose = 0; 213 #if !defined(DDB) 214 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 215 #endif 216 #endif 217 218 /* 219 * Traverse the (now) ordered list of system initialization tasks. 220 * Perform each task, and continue on to the next task. 221 * 222 * The last item on the list is expected to be the scheduler, 223 * which will not return. 224 */ 225 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 226 227 if ((*sipp)->subsystem == SI_SUB_DUMMY) 228 continue; /* skip dummy task(s)*/ 229 230 if ((*sipp)->subsystem == SI_SUB_DONE) 231 continue; 232 233 #if defined(VERBOSE_SYSINIT) 234 if ((*sipp)->subsystem > last) { 235 verbose = 1; 236 last = (*sipp)->subsystem; 237 printf("subsystem %x\n", last); 238 } 239 if (verbose) { 240 #if defined(DDB) 241 const char *name; 242 c_db_sym_t sym; 243 db_expr_t offset; 244 245 sym = db_search_symbol((vm_offset_t)(*sipp)->func, 246 DB_STGY_PROC, &offset); 247 db_symbol_values(sym, &name, NULL); 248 if (name != NULL) 249 printf(" %s(%p)... ", name, (*sipp)->udata); 250 else 251 #endif 252 printf(" %p(%p)... ", (*sipp)->func, 253 (*sipp)->udata); 254 } 255 #endif 256 257 /* Call function */ 258 (*((*sipp)->func))((*sipp)->udata); 259 260 #if defined(VERBOSE_SYSINIT) 261 if (verbose) 262 printf("done.\n"); 263 #endif 264 265 /* Check off the one we're just done */ 266 (*sipp)->subsystem = SI_SUB_DONE; 267 268 /* Check if we've installed more sysinit items via KLD */ 269 if (newsysinit != NULL) { 270 if (sysinit != SET_BEGIN(sysinit_set)) 271 free(sysinit, M_TEMP); 272 sysinit = newsysinit; 273 sysinit_end = newsysinit_end; 274 newsysinit = NULL; 275 newsysinit_end = NULL; 276 goto restart; 277 } 278 } 279 280 panic("Shouldn't get here!"); 281 /* NOTREACHED*/ 282 } 283 284 285 /* 286 *************************************************************************** 287 **** 288 **** The following SYSINIT's belong elsewhere, but have not yet 289 **** been moved. 290 **** 291 *************************************************************************** 292 */ 293 static void 294 print_caddr_t(void *data) 295 { 296 printf("%s", (char *)data); 297 } 298 299 static void 300 print_version(void *data __unused) 301 { 302 int len; 303 304 /* Strip a trailing newline from version. */ 305 len = strlen(version); 306 while (len > 0 && version[len - 1] == '\n') 307 len--; 308 printf("%.*s %s\n", len, version, machine); 309 } 310 311 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 312 copyright); 313 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 314 trademark); 315 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 316 317 #ifdef WITNESS 318 static char wit_warn[] = 319 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 320 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 321 print_caddr_t, wit_warn); 322 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 323 print_caddr_t, wit_warn); 324 #endif 325 326 #ifdef DIAGNOSTIC 327 static char diag_warn[] = 328 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 329 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 330 print_caddr_t, diag_warn); 331 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 332 print_caddr_t, diag_warn); 333 #endif 334 335 static int 336 null_fetch_syscall_args(struct thread *td __unused, 337 struct syscall_args *sa __unused) 338 { 339 340 panic("null_fetch_syscall_args"); 341 } 342 343 static void 344 null_set_syscall_retval(struct thread *td __unused, int error __unused) 345 { 346 347 panic("null_set_syscall_retval"); 348 } 349 350 struct sysentvec null_sysvec = { 351 .sv_size = 0, 352 .sv_table = NULL, 353 .sv_mask = 0, 354 .sv_sigsize = 0, 355 .sv_sigtbl = NULL, 356 .sv_errsize = 0, 357 .sv_errtbl = NULL, 358 .sv_transtrap = NULL, 359 .sv_fixup = NULL, 360 .sv_sendsig = NULL, 361 .sv_sigcode = NULL, 362 .sv_szsigcode = NULL, 363 .sv_prepsyscall = NULL, 364 .sv_name = "null", 365 .sv_coredump = NULL, 366 .sv_imgact_try = NULL, 367 .sv_minsigstksz = 0, 368 .sv_pagesize = PAGE_SIZE, 369 .sv_minuser = VM_MIN_ADDRESS, 370 .sv_maxuser = VM_MAXUSER_ADDRESS, 371 .sv_usrstack = USRSTACK, 372 .sv_psstrings = PS_STRINGS, 373 .sv_stackprot = VM_PROT_ALL, 374 .sv_copyout_strings = NULL, 375 .sv_setregs = NULL, 376 .sv_fixlimit = NULL, 377 .sv_maxssiz = NULL, 378 .sv_flags = 0, 379 .sv_set_syscall_retval = null_set_syscall_retval, 380 .sv_fetch_syscall_args = null_fetch_syscall_args, 381 .sv_syscallnames = NULL, 382 .sv_schedtail = NULL, 383 }; 384 385 /* 386 *************************************************************************** 387 **** 388 **** The two following SYSINIT's are proc0 specific glue code. I am not 389 **** convinced that they can not be safely combined, but their order of 390 **** operation has been maintained as the same as the original init_main.c 391 **** for right now. 392 **** 393 **** These probably belong in init_proc.c or kern_proc.c, since they 394 **** deal with proc0 (the fork template process). 395 **** 396 *************************************************************************** 397 */ 398 /* ARGSUSED*/ 399 static void 400 proc0_init(void *dummy __unused) 401 { 402 struct proc *p; 403 struct thread *td; 404 vm_paddr_t pageablemem; 405 int i; 406 407 GIANT_REQUIRED; 408 p = &proc0; 409 td = &thread0; 410 411 /* 412 * Initialize magic number and osrel. 413 */ 414 p->p_magic = P_MAGIC; 415 p->p_osrel = osreldate; 416 417 /* 418 * Initialize thread and process structures. 419 */ 420 procinit(); /* set up proc zone */ 421 threadinit(); /* set up UMA zones */ 422 423 /* 424 * Initialise scheduler resources. 425 * Add scheduler specific parts to proc, thread as needed. 426 */ 427 schedinit(); /* scheduler gets its house in order */ 428 /* 429 * Initialize sleep queue hash table 430 */ 431 sleepinit(); 432 433 /* 434 * additional VM structures 435 */ 436 vm_init2(); 437 438 /* 439 * Create process 0 (the swapper). 440 */ 441 LIST_INSERT_HEAD(&allproc, p, p_list); 442 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 443 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 444 p->p_pgrp = &pgrp0; 445 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 446 LIST_INIT(&pgrp0.pg_members); 447 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 448 449 pgrp0.pg_session = &session0; 450 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 451 refcount_init(&session0.s_count, 1); 452 session0.s_leader = p; 453 454 p->p_sysent = &null_sysvec; 455 p->p_flag = P_SYSTEM | P_INMEM; 456 p->p_state = PRS_NORMAL; 457 knlist_init_mtx(&p->p_klist, &p->p_mtx); 458 STAILQ_INIT(&p->p_ktr); 459 p->p_nice = NZERO; 460 td->td_tid = PID_MAX + 1; 461 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 462 td->td_state = TDS_RUNNING; 463 td->td_pri_class = PRI_TIMESHARE; 464 td->td_user_pri = PUSER; 465 td->td_base_user_pri = PUSER; 466 td->td_lend_user_pri = PRI_MAX; 467 td->td_priority = PVM; 468 td->td_base_pri = PVM; 469 td->td_oncpu = 0; 470 td->td_flags = TDF_INMEM|TDP_KTHREAD; 471 td->td_cpuset = cpuset_thread0(); 472 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 473 p->p_peers = 0; 474 p->p_leader = p; 475 476 477 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 478 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 479 480 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 481 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 482 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 483 484 /* Create credentials. */ 485 p->p_ucred = crget(); 486 p->p_ucred->cr_ngroups = 1; /* group 0 */ 487 p->p_ucred->cr_uidinfo = uifind(0); 488 p->p_ucred->cr_ruidinfo = uifind(0); 489 p->p_ucred->cr_prison = &prison0; 490 p->p_ucred->cr_loginclass = loginclass_find("default"); 491 #ifdef AUDIT 492 audit_cred_kproc0(p->p_ucred); 493 #endif 494 #ifdef MAC 495 mac_cred_create_swapper(p->p_ucred); 496 #endif 497 td->td_ucred = crhold(p->p_ucred); 498 499 /* Create sigacts. */ 500 p->p_sigacts = sigacts_alloc(); 501 502 /* Initialize signal state for process 0. */ 503 siginit(&proc0); 504 505 /* Create the file descriptor table. */ 506 p->p_fd = fdinit(NULL); 507 p->p_fdtol = NULL; 508 509 /* Create the limits structures. */ 510 p->p_limit = lim_alloc(); 511 for (i = 0; i < RLIM_NLIMITS; i++) 512 p->p_limit->pl_rlimit[i].rlim_cur = 513 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 514 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 515 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 516 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 517 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 518 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 519 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 520 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 521 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 522 /* Cast to avoid overflow on i386/PAE. */ 523 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 524 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 525 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 526 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 527 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 528 p->p_cpulimit = RLIM_INFINITY; 529 530 /* Initialize resource accounting structures. */ 531 racct_create(&p->p_racct); 532 533 p->p_stats = pstats_alloc(); 534 535 /* Allocate a prototype map so we have something to fork. */ 536 pmap_pinit0(vmspace_pmap(&vmspace0)); 537 p->p_vmspace = &vmspace0; 538 vmspace0.vm_refcnt = 1; 539 540 /* 541 * proc0 is not expected to enter usermode, so there is no special 542 * handling for sv_minuser here, like is done for exec_new_vmspace(). 543 */ 544 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 545 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 546 547 /* 548 * Call the init and ctor for the new thread and proc. We wait 549 * to do this until all other structures are fairly sane. 550 */ 551 EVENTHANDLER_INVOKE(process_init, p); 552 EVENTHANDLER_INVOKE(thread_init, td); 553 EVENTHANDLER_INVOKE(process_ctor, p); 554 EVENTHANDLER_INVOKE(thread_ctor, td); 555 556 /* 557 * Charge root for one process. 558 */ 559 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 560 PROC_LOCK(p); 561 racct_add_force(p, RACCT_NPROC, 1); 562 PROC_UNLOCK(p); 563 } 564 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 565 566 /* ARGSUSED*/ 567 static void 568 proc0_post(void *dummy __unused) 569 { 570 struct timespec ts; 571 struct proc *p; 572 struct rusage ru; 573 struct thread *td; 574 575 /* 576 * Now we can look at the time, having had a chance to verify the 577 * time from the filesystem. Pretend that proc0 started now. 578 */ 579 sx_slock(&allproc_lock); 580 FOREACH_PROC_IN_SYSTEM(p) { 581 microuptime(&p->p_stats->p_start); 582 PROC_SLOCK(p); 583 rufetch(p, &ru); /* Clears thread stats */ 584 PROC_SUNLOCK(p); 585 p->p_rux.rux_runtime = 0; 586 p->p_rux.rux_uticks = 0; 587 p->p_rux.rux_sticks = 0; 588 p->p_rux.rux_iticks = 0; 589 FOREACH_THREAD_IN_PROC(p, td) { 590 td->td_runtime = 0; 591 } 592 } 593 sx_sunlock(&allproc_lock); 594 PCPU_SET(switchtime, cpu_ticks()); 595 PCPU_SET(switchticks, ticks); 596 597 /* 598 * Give the ``random'' number generator a thump. 599 */ 600 nanotime(&ts); 601 srandom(ts.tv_sec ^ ts.tv_nsec); 602 } 603 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 604 605 static void 606 random_init(void *dummy __unused) 607 { 608 609 /* 610 * After CPU has been started we have some randomness on most 611 * platforms via get_cyclecount(). For platforms that don't 612 * we will reseed random(9) in proc0_post() as well. 613 */ 614 srandom(get_cyclecount()); 615 } 616 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 617 618 /* 619 *************************************************************************** 620 **** 621 **** The following SYSINIT's and glue code should be moved to the 622 **** respective files on a per subsystem basis. 623 **** 624 *************************************************************************** 625 */ 626 627 628 /* 629 *************************************************************************** 630 **** 631 **** The following code probably belongs in another file, like 632 **** kern/init_init.c. 633 **** 634 *************************************************************************** 635 */ 636 637 /* 638 * List of paths to try when searching for "init". 639 */ 640 static char init_path[MAXPATHLEN] = 641 #ifdef INIT_PATH 642 __XSTRING(INIT_PATH); 643 #else 644 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 645 #endif 646 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 647 "Path used to search the init process"); 648 649 /* 650 * Shutdown timeout of init(8). 651 * Unused within kernel, but used to control init(8), hence do not remove. 652 */ 653 #ifndef INIT_SHUTDOWN_TIMEOUT 654 #define INIT_SHUTDOWN_TIMEOUT 120 655 #endif 656 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 657 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 658 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 659 "Unused within kernel, but used to control init(8)"); 660 661 /* 662 * Start the initial user process; try exec'ing each pathname in init_path. 663 * The program is invoked with one argument containing the boot flags. 664 */ 665 static void 666 start_init(void *dummy) 667 { 668 vm_offset_t addr; 669 struct execve_args args; 670 int options, error; 671 char *var, *path, *next, *s; 672 char *ucp, **uap, *arg0, *arg1; 673 struct thread *td; 674 struct proc *p; 675 676 mtx_lock(&Giant); 677 678 GIANT_REQUIRED; 679 680 td = curthread; 681 p = td->td_proc; 682 683 vfs_mountroot(); 684 685 /* 686 * Need just enough stack to hold the faked-up "execve()" arguments. 687 */ 688 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 689 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 690 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 691 panic("init: couldn't allocate argument space"); 692 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 693 p->p_vmspace->vm_ssize = 1; 694 695 if ((var = getenv("init_path")) != NULL) { 696 strlcpy(init_path, var, sizeof(init_path)); 697 freeenv(var); 698 } 699 700 for (path = init_path; *path != '\0'; path = next) { 701 while (*path == ':') 702 path++; 703 if (*path == '\0') 704 break; 705 for (next = path; *next != '\0' && *next != ':'; next++) 706 /* nothing */ ; 707 if (bootverbose) 708 printf("start_init: trying %.*s\n", (int)(next - path), 709 path); 710 711 /* 712 * Move out the boot flag argument. 713 */ 714 options = 0; 715 ucp = (char *)p->p_sysent->sv_usrstack; 716 (void)subyte(--ucp, 0); /* trailing zero */ 717 if (boothowto & RB_SINGLE) { 718 (void)subyte(--ucp, 's'); 719 options = 1; 720 } 721 #ifdef notyet 722 if (boothowto & RB_FASTBOOT) { 723 (void)subyte(--ucp, 'f'); 724 options = 1; 725 } 726 #endif 727 728 #ifdef BOOTCDROM 729 (void)subyte(--ucp, 'C'); 730 options = 1; 731 #endif 732 733 if (options == 0) 734 (void)subyte(--ucp, '-'); 735 (void)subyte(--ucp, '-'); /* leading hyphen */ 736 arg1 = ucp; 737 738 /* 739 * Move out the file name (also arg 0). 740 */ 741 (void)subyte(--ucp, 0); 742 for (s = next - 1; s >= path; s--) 743 (void)subyte(--ucp, *s); 744 arg0 = ucp; 745 746 /* 747 * Move out the arg pointers. 748 */ 749 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 750 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 751 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 752 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 753 754 /* 755 * Point at the arguments. 756 */ 757 args.fname = arg0; 758 args.argv = uap; 759 args.envv = NULL; 760 761 /* 762 * Now try to exec the program. If can't for any reason 763 * other than it doesn't exist, complain. 764 * 765 * Otherwise, return via fork_trampoline() all the way 766 * to user mode as init! 767 */ 768 if ((error = sys_execve(td, &args)) == 0) { 769 mtx_unlock(&Giant); 770 return; 771 } 772 if (error != ENOENT) 773 printf("exec %.*s: error %d\n", (int)(next - path), 774 path, error); 775 } 776 printf("init: not found in path %s\n", init_path); 777 panic("no init"); 778 } 779 780 /* 781 * Like kproc_create(), but runs in it's own address space. 782 * We do this early to reserve pid 1. 783 * 784 * Note special case - do not make it runnable yet. Other work 785 * in progress will change this more. 786 */ 787 static void 788 create_init(const void *udata __unused) 789 { 790 struct ucred *newcred, *oldcred; 791 int error; 792 793 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 794 NULL, 0); 795 if (error) 796 panic("cannot fork init: %d\n", error); 797 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 798 /* divorce init's credentials from the kernel's */ 799 newcred = crget(); 800 PROC_LOCK(initproc); 801 initproc->p_flag |= P_SYSTEM | P_INMEM; 802 oldcred = initproc->p_ucred; 803 crcopy(newcred, oldcred); 804 #ifdef MAC 805 mac_cred_create_init(newcred); 806 #endif 807 #ifdef AUDIT 808 audit_cred_proc1(newcred); 809 #endif 810 initproc->p_ucred = newcred; 811 PROC_UNLOCK(initproc); 812 crfree(oldcred); 813 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 814 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 815 } 816 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 817 818 /* 819 * Make it runnable now. 820 */ 821 static void 822 kick_init(const void *udata __unused) 823 { 824 struct thread *td; 825 826 td = FIRST_THREAD_IN_PROC(initproc); 827 thread_lock(td); 828 TD_SET_CAN_RUN(td); 829 sched_add(td, SRQ_BORING); 830 thread_unlock(td); 831 } 832 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 833